package thread;

import java.util.*;

public class SyncDemo4 {
    /**
     * 并发安全的集合API:
     * ArrayList、LinkedList、HashSet
     * @param args
     */
    public static void main(String[] args) {
//        List<Integer>c=new ArrayList<>();
        Set<Integer>c= Collections.synchronizedSet(new HashSet<>());
        Thread t1=new Thread(){
            public void run(){
                for (int i=0;i<1000;i++){
                    c.add(i);
                }
            }
        };
        Thread t2=new Thread(){
            public void run(){
                for (int i=1000;i<2000;i++){
                    c.add(i);
                }
            }
        };
        t1.start();
        t2.start();
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
        }
        System.out.println(c.size());
    }
}
